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RADIUS
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RADIUS
Question 1,858 of 1,420
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350-401 Practice Question: Drag and drop each AAA service on the left to its…
Drag and drop each AAA service on the left to its matching protocol on the right.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Authentication: RADIUS
Authentication uses RADIUS; authorization uses TACACS+; accounting uses RADIUS; command authorization uses TACACS+; dot1x authentication uses RADIUS.
Quick reference
AAA Protocol Comparison
| Protocol | Port(s) | Encryption | Transport | Primary Use |
|---|---|---|---|---|
| RADIUS | 1812 / 1813 | Password only | UDP | Network access control |
| TACACS+ | 49 | Full packet | TCP | Device administration |
| Diameter | 3868 | Full session | TCP / SCTP | Carrier / mobile networks |
| 802.1X | — | EAP-based | Layer 2 | Port-based access control |
TACACS+ encrypts the entire packet; RADIUS only encrypts the password field — a key exam distinction.
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Same concept, more angles
1 more way this is tested on 350-401
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Drag and drop each AAA service on the left to its matching protocol on the right.
medium- ✓ P1.Authentication: RADIUS
- ✓ P2.Authorization: TACACS+
- ✓ P3.Accounting: RADIUS
- ✓ P4.Encryption of entire packet: TACACS+
- ✓ P5.Separation of AAA functions: TACACS+
Why P1: Authentication typically uses RADIUS, authorization uses TACACS+, accounting can use either, but RADIUS is more common for accounting; TACACS+ encrypts the entire packet and separates AAA functions.
Last reviewed: Jun 18, 2026
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